US11953046B2 - Nut - Google Patents
Nut Download PDFInfo
- Publication number
- US11953046B2 US11953046B2 US17/432,760 US202017432760A US11953046B2 US 11953046 B2 US11953046 B2 US 11953046B2 US 202017432760 A US202017432760 A US 202017432760A US 11953046 B2 US11953046 B2 US 11953046B2
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- US
- United States
- Prior art keywords
- nut
- bolt
- hole
- cos
- equation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active, expires
Links
- 238000003780 insertion Methods 0.000 claims abstract description 5
- 230000037431 insertion Effects 0.000 claims abstract description 5
- 238000005259 measurement Methods 0.000 description 7
- 239000011295 pitch Substances 0.000 description 6
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
- F16B33/02—Shape of thread; Special thread-forms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
Definitions
- the present invention relates to a nut.
- Patent Literature 1 A nut is known as described in Patent Literature 1.
- Patent Literature 1 JP-A-1995-238914
- Patent Literature 1 suggests a nut provided with a screw-in introduction unit without a screw thread in a screw hole. By providing the nut, Patent Literature 1 can improve the bite of a bolt and a nut, or hold the bolt and the nut at a right angle to prevent diagonal biting of the bolt and the nut.
- An object of the present invention is to provide a nut in which galling during fastening is prevented.
- t ( D ⁇ d ⁇ cos ⁇ )/tan ⁇ Equation (1)
- FIG. 1 is a top view of a nut according to an embodiment of the present invention.
- FIG. 2 is a sectional view taken along line II-II of the nut shown in FIG. 1 .
- FIG. 3 is a view showing an aspect of a galling angle measurement test equipment.
- FIG. 4 is a view showing a measurement result of an inclination angle.
- FIG. 5 is a view for describing the inclination angle.
- FIG. 6 is a view for describing a depth of a counterbore hole.
- FIGS. 1 and 2 describe a nut 1 according to an embodiment of the present invention.
- FIG. 1 is a top view of the nut 1
- FIG. 2 is a sectional view taken along line II-II of FIG. 1 .
- the nut 1 is provided with a screw hole 2 .
- a counterbore hole 3 is provided on the insertion side of the screw hole 2 .
- the counterbore hole 3 is a hole with no screw thread on the inner circumferential surface.
- the counterbore hole 3 has a smooth inner circumferential surface.
- the nut 1 of the present embodiment prevents the screw thread of a bolt 10 inserted while being inclined to the screw hole 2 of the nut 1 from coming into contact with the smooth inner circumferential surface of the counterbore hole 3 , and prevents the bolt 10 from being screwed into the nut 1 while being inclined.
- galling a phenomenon in which the bolt 10 is inserted into the nut 1 while being inclined and the screw thread of the bolt 10 gnaws the screw thread of the nut 1 .
- the inventor thought that the inclination angle (hereinafter, simply referred to as inclination angle) of the bolt 10 to the screw hole 2 of the nut 1 was one of the reasons of the occurrence of galling, and conducted experiments using an experiment device shown in FIG. 3 .
- FIG. 3 is a view showing an aspect of galling angle measurement test equipment 20 .
- the nut 1 is fixed to a stage that can rotate around a rotation axial line Y that extends in the horizontal direction.
- the nut 1 is fixed to a stage in a posture where the screw hole 2 extends in the vertical direction.
- the galling angle measurement test equipment 20 is configured to be capable of detecting the rotation angle around the rotation axial line Y as the inclination angle.
- the bolt 10 is screwed into the nut 1 from above in the vertical direction.
- the bolt 10 is rotated around the rotation axial line that extends in the vertical direction at a constant rotation speed by a motor (not shown). Even when rotating the bolt 10 , the posture of the bolt 10 does not change. In other words, even when rotating the bolt 10 , the axial line of the bolt 10 remains in the vertical direction.
- an initial state where the upper surface of the stage makes an angle to the horizontal direction can be set before the start of the test.
- the bolt 10 can be screwed into the nut 1 in a state where the bolt 10 and the nut 1 make an inclination angle.
- the inclination angle is an angle made by the axial line g of the bolt 10 and the axial line G of the nut 1 , when viewed from the viewpoint where the angle made by the axial line g of the bolt 10 and the axial line G of the nut 1 is the greatest.
- FIG. 4 is a view showing the measurement result of the inclination angle. As shown in FIG. 4 , it was confirmed that the inclination angle fluctuated greatly when the inclination angle was between 8.8° and 9.2°, and galling occurred. In the example shown in FIG. 4 , when the bolt 10 is continued to be rotated after galling occurs, the inclination angle fluctuation stabilizes after the inclination angle suddenly becomes small, and the bolt 10 and the nut 1 are fastened at an inclination angle of approximately 3.6°.
- FIG. 5 is a sectional view showing an aspect where the bolt 10 is screwed into the nut 1 at the inclination angle.
- FIG. 5 is a view of the cross section of the nut 1 and the bolt 10 when the inclination angle is maximum.
- the angle between the nut axial line G (the center line of the screw hole 2 ) and the bolt axial line g (the center line of the bolt 10 ) is defined as an inclination angle ⁇ .
- the root diameter of the screw hole 2 of the nut 1 is D (nominal diameter D), and the outer diameter of the bolt 10 that fits into the nut 1 having the nominal diameter D is d.
- a first thread X 2 positioned on the right side of the bolt 10 is engaged with a screw thread Y 3 instead of a first screw thread Y 2 positioned on the right side of the nut 1 .
- one pitch of a tip of the bolt 10 is an incomplete screw thread.
- a depth t of the counterbore hole 3 to be provided for such purpose can he obtained as follows in relation to the nut 1 having the nominal diameter D.
- points A to C, F, and E and the length t are defined as follows.
- the length of a line segment CF is equal to the root diameter (nominal diameter D) of the screw hole 2 of the nut 1 .
- the length of a side AC of a right triangle ABC is a cosine component of a side AB, which is the outer diameter d of the bolt 10 .
- AC d ⁇ cos ⁇ .
- the length of a line segment AF is a length obtained by subtracting the line segment AC from the root diameter (nominal diameter D) of the screw hole 2 of the nut 1 .
- AF D ⁇ d ⁇ cos ⁇ .
- the depth t can be expressed by the following Equation (2).
- t ( D ⁇ d ⁇ cos ⁇ )/tan ⁇ Equation (2)
- the inclination angle between the bolt 10 and the nut 1 that is formed when the screw threads of the bolt 10 begin to be engaged with the screw threads of the nut 1 can be set to be less than the angle at which galling is likely to occur.
- the inlet of the nut 1 has a chamfer portion for 1.25 ⁇ pitch.
- the bolt 10 will be inserted shallowly into the nut 1 by this amount (1.25 ⁇ P/ ⁇ 2).
- the depth t of the counterbore hole 3 is deepened by this amount (1.25 ⁇ P/ ⁇ 2).
- the depth of the counterbore hole 3 is greater than t 2 in the following Equation (4).
- the inner diameter D of the counterbore, hole 3 was set to the nominal diameter of the nut 1 , but it is preferable to set D to the nominal diameter of the nut 1 +0.2 [mm] to ensure that the screw threads of the nut 1 do not come into contact with the screw threads of the bolt 10 .
- d is simply described as the outer diameter of the bolt 10 , but the outer diameter of the bolt 10 varies depending on the tolerance even for the bolt 10 having the same nominal diameter. Therefore, the average value of the maximum outer diameter and the minimum outer diameter of the bolt 10 corresponding to the nominal diameter D is used as the outer diameter d of the bolt 10 .
- pilot bolt may also be screwed into the nut 1 . Since the pilot bolt has a guide portion without screw threads at the tip, even when the pilot bolt is diagonally inserted into the nut 1 , the screw threads of the pilot bolt are unlikely to interfere with the screw threads of the nut 1 and galling is unlikely to occur.
- a nut in which galling due to a bolt during fastening is prevented.
Abstract
Description
t=(D−d×cos θ)/tan θ Equation (1)
θ=arc tan(P/d) Equation (1)
-
- Point A: Of the two vertices of the lower edge of the
bolt 10, a point (the lowest point of the bolt 10) which is inserted deeply into the nut 1 - Point B: Of the two vertices of the lower edge of the
bolt 10, a point which is inserted shallowly into the nut 1 - Point C: A point where the line segment orthogonal to the nut axial line G through the point A intersects the inner circumferential surface of the nut 1 at the point B side
- Point F: A point where the line segment orthogonal to the nut axial line G through the point A intersects the inner circumferential surface of the nut 1 on the opposite side of the point B
- Point E: A point where the line segment parallel to the nut axial line through the point F intersects the upper surface of the nut 1
- Length t: Length (distance between the lowest point of the
bolt 10 and the upper surface of the nut 1, parallel to the nut axial line G) of a line segment FE
- Point A: Of the two vertices of the lower edge of the
t=(D−d×cos θ)/tan θ Equation (2)
θ=arc tan(P/d) Equation (1)
t=(D−d×cos θ)/tan θ Equation (2)
t1=(D−d×cos θ)/tan θ+2P/cos θ Equation (3)
t2=(D−d×cos θ)/tan θ+2P/cos θ+1.25×P/√2 Equation (4)
-
- 1: nut
- 2: hole
- 3: counterbore hole
- 10: bolt
- 20: galling angle measurement test equipment
- g: bolt axial line
- G: nut axial line
- P: pitch
- θ: inclination angle
Claims (3)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2019-030448 | 2019-02-22 | ||
JP2019030448A JP2020133819A (en) | 2019-02-22 | 2019-02-22 | nut |
PCT/JP2020/006881 WO2020171181A1 (en) | 2019-02-22 | 2020-02-20 | Nut |
Publications (2)
Publication Number | Publication Date |
---|---|
US20220136552A1 US20220136552A1 (en) | 2022-05-05 |
US11953046B2 true US11953046B2 (en) | 2024-04-09 |
Family
ID=72144505
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17/432,760 Active 2041-01-22 US11953046B2 (en) | 2019-02-22 | 2020-02-20 | Nut |
Country Status (4)
Country | Link |
---|---|
US (1) | US11953046B2 (en) |
JP (1) | JP2020133819A (en) |
CN (1) | CN113544391B (en) |
WO (1) | WO2020171181A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11142316B2 (en) | 2018-02-08 | 2021-10-12 | Vita Inclinata Technologies, Inc. | Control of drone-load system method, system, and apparatus |
US11618566B1 (en) | 2019-04-12 | 2023-04-04 | Vita Inclinata Technologies, Inc. | State information and telemetry for suspended load control equipment apparatus, system, and method |
JP2022182982A (en) * | 2021-05-28 | 2022-12-08 | 大洋ナット工業株式会社 | Single pipe clamp including screw rod with nut |
Citations (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57115419U (en) | 1981-01-12 | 1982-07-17 | ||
US4485510A (en) * | 1982-01-11 | 1984-12-04 | Hi-Shear Corporation | Threaded fastener having minimized length and weight and method to make it |
JPS60188217U (en) | 1983-07-01 | 1985-12-13 | 三菱電機株式会社 | Nut with guide |
US4790703A (en) * | 1987-04-24 | 1988-12-13 | Wing George S | Prevailing torque fastener assembly |
US4850771A (en) * | 1986-04-01 | 1989-07-25 | Hurd Ramon L | Installation system for securing workpieces of composite materials and the like and threaded fastener for such system |
US4957401A (en) * | 1982-01-11 | 1990-09-18 | Hi-Shear Corporation | Threaded fastener having minimized length and weight and method to make it |
JPH07238914A (en) | 1994-02-28 | 1995-09-12 | Masao Hashiba | Female screw hole with male screw leading-in part |
US5860778A (en) * | 1996-10-29 | 1999-01-19 | Mcdonnell Douglas Corporation | Torque- and preload-controlled fastener and associated method of fastening |
US6095733A (en) * | 1998-06-29 | 2000-08-01 | Huck International, Inc. | Threaded fastener with determinable clamp load |
JP2000291620A (en) | 1999-04-05 | 2000-10-20 | Sugiura Seisakusho:Kk | Bolt and its manufacture |
US6149363A (en) * | 1998-10-29 | 2000-11-21 | Huck International, Inc. | Lightweight threaded fastener and thread rolling die |
US6206625B1 (en) * | 1998-02-26 | 2001-03-27 | European Locking Devices S.A. | Nut with positive and micrometric automatic locking |
US20010026746A1 (en) * | 2000-03-02 | 2001-10-04 | Frank Calandra | Flange nut |
US20080193254A1 (en) * | 2007-02-09 | 2008-08-14 | Stephen Selle | Fastener |
WO2010086962A1 (en) | 2009-01-28 | 2010-08-05 | Necディスプレイソリューションズ株式会社 | Female screw member |
US20110311334A1 (en) * | 2010-06-17 | 2011-12-22 | Newfrey Llc | Blind fastener and producton method thereof |
US20180355904A1 (en) | 2017-06-13 | 2018-12-13 | Iwata Bolt Co., Ltd. | Bolt |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006134626A1 (en) * | 2005-06-13 | 2006-12-21 | Aoyama Seisakusho Co., Ltd. | Bolt |
JP2007085444A (en) * | 2005-09-21 | 2007-04-05 | Yasuo Hirano | Bolt and lock bolt using the same bolt |
JP5957716B2 (en) * | 2012-06-01 | 2016-07-27 | 株式会社青山製作所 | Seizure prevention bolt |
-
2019
- 2019-02-22 JP JP2019030448A patent/JP2020133819A/en active Pending
-
2020
- 2020-02-20 WO PCT/JP2020/006881 patent/WO2020171181A1/en active Application Filing
- 2020-02-20 US US17/432,760 patent/US11953046B2/en active Active
- 2020-02-20 CN CN202080015737.4A patent/CN113544391B/en active Active
Patent Citations (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57115419U (en) | 1981-01-12 | 1982-07-17 | ||
US4485510A (en) * | 1982-01-11 | 1984-12-04 | Hi-Shear Corporation | Threaded fastener having minimized length and weight and method to make it |
US4957401A (en) * | 1982-01-11 | 1990-09-18 | Hi-Shear Corporation | Threaded fastener having minimized length and weight and method to make it |
JPS60188217U (en) | 1983-07-01 | 1985-12-13 | 三菱電機株式会社 | Nut with guide |
US4850771A (en) * | 1986-04-01 | 1989-07-25 | Hurd Ramon L | Installation system for securing workpieces of composite materials and the like and threaded fastener for such system |
US4790703A (en) * | 1987-04-24 | 1988-12-13 | Wing George S | Prevailing torque fastener assembly |
JPH07238914A (en) | 1994-02-28 | 1995-09-12 | Masao Hashiba | Female screw hole with male screw leading-in part |
US5860778A (en) * | 1996-10-29 | 1999-01-19 | Mcdonnell Douglas Corporation | Torque- and preload-controlled fastener and associated method of fastening |
US6206625B1 (en) * | 1998-02-26 | 2001-03-27 | European Locking Devices S.A. | Nut with positive and micrometric automatic locking |
US6095733A (en) * | 1998-06-29 | 2000-08-01 | Huck International, Inc. | Threaded fastener with determinable clamp load |
US6149363A (en) * | 1998-10-29 | 2000-11-21 | Huck International, Inc. | Lightweight threaded fastener and thread rolling die |
JP2000291620A (en) | 1999-04-05 | 2000-10-20 | Sugiura Seisakusho:Kk | Bolt and its manufacture |
US20010026746A1 (en) * | 2000-03-02 | 2001-10-04 | Frank Calandra | Flange nut |
US20080193254A1 (en) * | 2007-02-09 | 2008-08-14 | Stephen Selle | Fastener |
WO2010086962A1 (en) | 2009-01-28 | 2010-08-05 | Necディスプレイソリューションズ株式会社 | Female screw member |
US20110311334A1 (en) * | 2010-06-17 | 2011-12-22 | Newfrey Llc | Blind fastener and producton method thereof |
US20180355904A1 (en) | 2017-06-13 | 2018-12-13 | Iwata Bolt Co., Ltd. | Bolt |
CN109083911A (en) | 2017-06-13 | 2018-12-25 | 岩田螺丝株式会社 | bolt |
Non-Patent Citations (3)
Title |
---|
Apr. 21, 2020, International Search Opinion issued for related PCT Application No. PCT/JP2020/006881. |
Apr. 21, 2020, International Search Report issued for related PCT Application No. PCT/JP2020/006881. |
Jan. 5, 2023, Chinese Office Action issued for related CN Application No. 202080015737.4. |
Also Published As
Publication number | Publication date |
---|---|
JP2020133819A (en) | 2020-08-31 |
WO2020171181A1 (en) | 2020-08-27 |
CN113544391B (en) | 2023-08-25 |
CN113544391A (en) | 2021-10-22 |
US20220136552A1 (en) | 2022-05-05 |
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Owner name: IWATA BOLT CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SHIBUSAWA, TETSUO;TASAKA, KENTA;REEL/FRAME:057242/0905 Effective date: 20210817 |
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